The Washington Post's Eugene Robinson writes that the only reasonable conclusion to draw from Romney's resistance to releasing his tax returns is that he believes doing so will cost him more support than withholding them will.

Mitt Romney has every right to cloak his personal and professional finances in secrecy — and voters have every right to assume he has something embarrassing to hide. If this seems unfair, Romney has only himself to blame.

Through a series of miscalculations, Romney has managed to turn what should have been a minor hiccup into what may be a defining moment, and not in a good way. Attacks by President Obama's campaign serve mainly to draw attention to the train wreck.

On the Sunday morning talk shows, even Republicans urged Romney to release more tax returns while wondering what secrets he's trying to keep. And the campaign's latest attempt to explain how and when Romney left Bain Capital — he's supposed to have "retired retroactively" at some unspecified date — became an instant punch line.

If Romney really does have the power to bend time and space, he might want to retroactively clean up the mess he's made.

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